Fish and blue crab passage through water control structures of a coastal bay lake
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Published source details
Rulifson R.A. & Wall B.L. (2006) Fish and blue crab passage through water control structures of a coastal bay lake. North American Journal of Fisheries Management, 26, 317-326.
Published source details Rulifson R.A. & Wall B.L. (2006) Fish and blue crab passage through water control structures of a coastal bay lake. North American Journal of Fisheries Management, 26, 317-326.
Actions
This study is summarised as evidence for the following.
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Modify operation of dams/barriers Action Link |
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Modify operation of dams/barriers
A replicated study in 1997–1998 in two canals in North Carolina, USA (Rulifson & Wall 2006) reported that slotted weirs were used by more adult American eels Anguilla rostrata than stainless steel flap gates to pass upstream through concrete barriers in canals. Results are not based on tests of statistical significance. In two sample years, 8–16 eels (0.006–0.010 eels/hour) passed through slotted weirs, while 0–8 eels (0–0.007 eels/hour) passed through stainless steel flap gates. However, authors noted that in 1998, flap gates in one of the canals were often clogged by floating debris, causing them to close. Two manually-operated slotted weirs (61 cm high x 30 cm wide x 61 cm deep, with a 4-cm wide centre slot) were installed in 1996 and two stainless steel flap gates (152 cm wide x 61 cm deep) were installed in 1989 at one barrier (water control structure) in each of two canals. Slotted weirs were open for the entire sampling period. Flap gates opened passively, depending on water flow. Barriers were located at the entrance to a lake. In February–May 1997 and 1998, adult eels were captured in a trap (made of 13-mm-bar wire mesh) deployed upstream (on the lake side) of each slotted weir and flap gate for 6–8 hours/day over 65–84 days.
(Summarised by: Vanessa Cutts)
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